functi '' + '';

//编译的时候出现了this.getid()必须要赋予一个变量的问题，也就是左值问题

求教！！！！！！！！
branchString += ''>< img src="http://www.dedecms.com/web-art/htmlbase/Javascript/20050401/plus.gif" id="I'' + this.id + ''">'' + this.text;
branchString += ''< /span>'';
branchString += ''< span class="leaf" id="'';
branchString += this.id + ''">'';
var numLeaves = this.leaves.length;
for (var j=0;j< numLeaves;j++) branchString += this.leaves[j].write();
branchString += ''< /span>'';
return branchString;
}

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